Figure 4. CaPstone formers have the highest incidence of severe tubular plugging (> 1% surface area) compared to CaOx formers and CaOx stone formers with maladsorption.

Within the CaP group, the brushite stone formers had a greater percentage with plugs than those with apatite stones. Black = plugs > 1%, Grey = 0 < plugs < 1%, White = no plugs.